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Pin Listing and Signal Definitions
Table 37. Signal Description (Page 7 of 8)
Name
SKTOCC#
Type
Output
Description
SKTOCC# (Socket Occupied) will be pulled to ground by the processor. System
board designers may use this pin to determine if the processor is present.
Input
SLP# (Sleep), when asserted in Stop-Grant state, causes the processor to enter the
Sleep state. During Sleep state, the processor stops providing internal clock signals
to all units, leaving only the Phase-Locked Loop (PLL) still operating. Processors in
this state will not recognize snoops or interrupts. The processor will only recognize
the assertion of the RESET# signal, deassertion of SLP#, and assertion of DPSLP#
input while in Sleep state. If SLP# is deasserted, the processor exits Sleep state
and returns to Stop-Grant state, restarting its internal clock signals to the bus and
processor core units. If the BCLK input is stopped or if DPSLP# is asserted while in
the Sleep state, the processor will exit the Sleep state and transition to the Deep
Sleep state.
Input
SMI# (System Management Interrupt) is asserted asynchronously by system logic.
On accepting a System Management Interrupt, the processor saves the current
state and enter System Management Mode (SMM). An SMI Acknowledge
transaction is issued, and the processor begins program execution from the SMM
handler.
If SMI# is asserted during the deassertion of RESET# the processor will tristate its
outputs.
STPCLK#
Input
Assertion of STPCLK# (Stop Clock) causes the processor to enter a low power
Stop-Grant state. The processor issues a Stop-Grant Acknowledge transaction, and
stops providing internal clock signals to all processor core units except the system
bus and APIC units. The processor continues to snoop bus transactions and
service interrupts while in Stop-Grant state. When STPCLK# is deasserted, the
processor restarts its internal clock to all units and resumes execution. The
assertion of STPCLK# has no effect on the bus clock; STPCLK# is an
asynchronous input.
TCK
Input
TCK (Test Clock) provides the clock input for the processor Test Bus (also known
as the Test Access Port).
TDI
Input
TDI (Test Data In) transfers serial test data into the processor. TDI provides the
serial input needed for JTAG specification support.
TDO
Output
TDO (Test Data Out) transfers serial test data out of the processor. TDO provides
the serial output needed for JTAG specification support.
TESTHI[10:8]
TESTHI[5:0]
Input
TESTHI[10:8] and TESTHI[5:0] must be connected to a VCC power source through
a resistor for proper processor operation. See Section 2.5 for more details.
THERMDA
Other
Thermal Diode Anode. See Section 6.
THERMDC
Other
Thermal Diode Cathode. See Section 6.
SLP#
SMI#
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